wg-akash-website: Updates for gpu-testnet page

[brewsterdrinkwater]

These are changes to the Akash.network/gpu-testnet page.

• Change the dates for the GPU Testnet to "June 20th, 2023 - July 11th, 2023"

• Add link for "GPU Docs" to (https://docs.akash.network/other-resources/experimental/testnet)
• Remove button for "KYC Guidelines"

[anilmurty]

Also update Tensorflow to Pytorch (Torchbench) (ref: akash-network/community#242)

[zachhorn]

Additional changes:

• Remove the periods at the end of "Set up a GPU provider" and "Deploy AI models"
• Change the copy to "Benchmark GPUs using PyTorch"

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• Remove the highlighted copy
• Remove the section divider above the highlighted copy

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• Change the highlighted copy to "Be among the first to test a revolutionary open-source marketplace for GPU compute"

[brewsterdrinkwater]

PR #166 solves this issue from @ArthurEmma2